10 August, 2022
This document summarizes estimates of change in mature individuals over time for Pacific salmon Designatable Unit (DU) and associated probable COSEWIC status designation. Data sources are detailed here and all code to reproduce the analyses in this document is here. These materials are solely intended to support the Marine Fishes sub-committee of COSEWIC in identifying high priority DUs for COSEWIC to consider when conducting formal status assessments.
Initial thoughts on potential decision nodes in the prioritization process.
Have DUs been formally defined by COSEWIC? Chinook, sockeye, and coho salmon DUs have been defined (reports available here), formal pink and chum DU identification is in progress. If yes then proceed.
Is information on mature individuals over time available at the DU scale? If yes then proceed.
Has DU been previously assessed by COSEWIC? If yes then consider a re-assessment, otherwise proceed except for DUs that have already been approved for a status assessment.
What is the DUs probable designation based on percentage change in mature individuals over past three generations? If special concern, threatened or endangered then proceed.
Are there spatial considerations? Are there commonalities in threats, designations, and/or data landscape at a regional scale that suggest a group of DUs should be bundled together?
The status summaries for all DUs are available for viewing or download in a large table here. A preview of the table is shown below.
## Region Species DU % Change (recent) COSEWIC status Probable status
## 1 Fraser Chinook CK1 457 Threatened Not at risk
## 2 Fraser Chinook CK10 -63 Threatened Threatened
## 3 Fraser Chinook CK11 -46 Endangered Special concern
## 4 Fraser Chinook CK12 -22 Not at risk Not at risk
## 5 Fraser Chinook CK13 -15 Endangered Not at risk
## 6 Fraser Chinook CK14 -89 Endangered Endangered